EP 0248719 B1 19910731 - LIQUID CIRCUIT BUBBLE DETECTOR
Title (en)
LIQUID CIRCUIT BUBBLE DETECTOR
Publication
Application
Priority
FR 8607657 A 19860528
Abstract (en)
[origin: US4784643A] First and second spaced apart optical emitter-receiving pairs are located along a liquid carrying conduit. A regulator circuit is coupled to each emitter-receiver pair to control the operation of that pair inside a maximum response range regardless of the transparency of the liquid. The regulator circuit is so arranged as to supply the emitter with a voltage which is a function of the difference between a voltage supplied by the receiver portion of an optical-receiver pair and a reference voltage. A differential circuit produces a differential signal representing the difference between the signals produced by the receiver portions of the optical emitter-receiver pairs and a comparator circuit is connected to the differential circuit in order to generate an alarm signal as a function of the differential signal. The detector is particularly useful as an air bubble detector in a transfusion or perfusion system, and can also provide a container-empty alarm in such systems.
IPC 1-7
IPC 8 full level
A61M 5/14 (2006.01); A61M 5/36 (2006.01); G01P 13/00 (2006.01)
CPC (source: EP US)
A61M 5/365 (2013.01 - EP US); G01P 13/0086 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0248719 A1 19871209; EP 0248719 B1 19910731; AT E65700 T1 19910815; DE 3771785 D1 19910905; FR 2599496 A1 19871204; FR 2599496 B1 19920214; US 4784643 A 19881115
DOCDB simple family (application)
EP 87401210 A 19870529; AT 87401210 T 19870529; DE 3771785 T 19870529; FR 8607657 A 19860528; US 5496887 A 19870528